package com.dzg.demo.example.commonUnsafe;

import com.dzg.demo.annoations.NotThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

@Slf4j
@NotThreadSafe
public class DateFormatExample1 {
    private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
    //    请求总数
    public static int clientTotal = 5000;
    //   同时并发执行的线程数
    public static int threadTotal = 200;

    public static void main(String[] args) throws InterruptedException {
        ExecutorService executorService = Executors.newCachedThreadPool();
        final Semaphore semaphore = new Semaphore(threadTotal);
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i <clientTotal ; i++) {
            executorService.execute(()->{
                try {
                    semaphore.acquire();
                    update();
                    semaphore.release();
                } catch (InterruptedException e) {
                    log.error("exception",e);
                }
                countDownLatch.countDown();

            });

        }
        countDownLatch.await();
        executorService.shutdown();
//        log.info("size:{}",stringBuilder.length());

    }
    private static void update() {
        try {
            simpleDateFormat.parse("20180831");
        } catch (ParseException e) {
            log.error("ParseException",e);
        }
    }
}
